Question

the hertzsprung-russell diagram shows the positions of stars based on several different characteristics. luminosity refers to a star’s brightness. it is plotted on the vertical axis. which statement is correct?
low mass stars are brighter than high mass stars.
low mass stars are brighter than white dwarfs.
the sun is brighter than white dwarfs
white dwarfs are brighter than red super giants.

Explanation:

Step1: Analyze each option using the HR diagram

• For "Low mass stars are brighter than high mass stars": High - mass stars are generally more luminous (brighter) than low - mass stars on the HR diagram. So this is incorrect.
• For "Low mass stars are brighter than white dwarfs": Low - mass main - sequence stars (like red dwarfs) have higher luminosity (brighter) than white dwarfs. White dwarfs are low - luminosity stars. So this is correct.
• For "The sun is brighter than white dwarfs": The Sun is a main - sequence star with higher luminosity than white dwarfs. But let's check the next option too.
• For "White dwarfs are brighter than red supergiants": Red supergiants are among the most luminous (brightest) stars, while white dwarfs are low - luminosity. So this is incorrect.

Answer:

Low mass stars are brighter than white dwarfs.